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# D01-27

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Math Expert
Joined: 02 Sep 2009
Posts: 53063

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15 Sep 2014, 23:12
00:00

Difficulty:

5% (low)

Question Stats:

90% (00:56) correct 10% (01:36) wrong based on 141 sessions

### HideShow timer Statistics

It takes computer A 6 hours and 40 minutes to finish a job. If computer B can process the same job in 10 hours, how long will it take, for both computers working together, to finish the job?

A. 6 hours and 20 minutes
B. 5 hours and 10 minutes
C. 4 hours and 40 minutes
D. 4 hours
E. 3 hours and 20 minutes

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Math Expert
Joined: 02 Sep 2009
Posts: 53063

### Show Tags

15 Sep 2014, 23:12
1
Official Solution:

It takes computer A 6 hours and 40 minutes to finish a job. If computer B can process the same job in 10 hours, how long will it take, for both computers working together, to finish the job?

A. 6 hours and 20 minutes
B. 5 hours and 10 minutes
C. 4 hours and 40 minutes
D. 4 hours
E. 3 hours and 20 minutes

After rewriting the time needed to finish the job in minutes, we construct an equation:
$$\frac{1}{400}+\frac{1}{600} = \frac{3+2}{1200} = \frac{5}{1200} = \frac{1}{240}$$

240 minutes equals 4 hours.

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Intern
Joined: 14 Jun 2018
Posts: 47
Location: India
Concentration: International Business, Marketing

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03 Sep 2018, 17:32
The Solution is helpful. btw which level questions are these?
Math Expert
Joined: 02 Sep 2009
Posts: 53063

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03 Sep 2018, 22:49
Shridhyey wrote:
The Solution is helpful. btw which level questions are these?

According to the stats this particular question is 700-level. You can check the difficulty level of a question and additional stats on it in the first post.
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Manager
Joined: 30 Oct 2018
Posts: 59

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17 Nov 2018, 11:34
In gmat club test it was mentioned under Level 500 question.
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Plz Kudos! if my post helps....

Intern
Joined: 15 Nov 2018
Posts: 2
Location: Mexico
Schools: Sloan '21
GMAT 1: 730 Q48 V42
GPA: 3.09

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05 Dec 2018, 14:55
Seems to me like a 600 level as it is a straight forward question but the numbers are not the easiest to work with...
Re: D01-27   [#permalink] 05 Dec 2018, 14:55
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# D01-27

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